.Dd $Mdocdate$
.Dt WATCH 1
.Os
.Sh NAME
.Nm watch
.Nd a simple file watcher
.\"
.Sh SYNPOSIS
.Nm watch
.Op Fl i
.Ar file ...
.\"
.Sh DESCRIPTION
.Nm watch
is a simple OpenBSD program that watches any given
.Ar file
for changes.
When the file changes, its name (as specified in the arguments to
.Nm watch )
is printed on standard output.

If the
.Fl i
argument is provided, an initial such line is printed when the program
starts, before beginning to watch for changes.

.Nm watch
exits on SIGINT (C-c).
.\"
.Sh ERRORS
If one of the watched files is deleted, a message is printed on standard
error and the program exits with error code 1.

If a file is renamed, a notice is printed on standard error, but the
program keeps running.
.\"
.Sh EXAMPLES
.Bd -literal -offset indent
$ watch *.ms | while read file; do
	make ${file%.ms}.pdf && kill -9 mupdf
done
.Ed
.Bd -literal -offset indent
$ alias each='xargs -L0 -I {}'
$ watch -i * | each cp {} /mnt/usb/
.Ed
.\"
.Sh AUTHORS
.Nm watch
is written by
.An John Ankarström ,
available {on the web|by e-mail} at john{.|@}ankarstrom.se.